Process for the preparation of transparent shaped articles

C - Chemistry – Metallurgy – 08 – L

Patent

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Details

C08L 67/02 (2006.01) B32B 7/02 (2006.01) B32B 27/08 (2006.01) C08L 77/02 (2006.01) C08L 77/06 (2006.01)

Patent

CA 2598563

Disclosed is a process for the preparation of shaped articles such as, for example, sheeting, films, tubes, bottles, preforms and profiles, having high transparency and low haze comprising immiscible blends of one or more thermoplastic polymers selected from polyesters, polycarbonates, and polyarylates, and a copolyamide or a transamidized, homogeneous blend of a least two polyamides. The components of the immiscible blend which have refractive indices which differ by about 0.006 to about -0.0006. The small difference in the refractive indices enable the incorporation of regrind into the polymer composition to produce transparent shaped articles. These articles may have one or more layers and can exhibit improved excellent barrier properties and good melt processability while retaining excellent mechanical properties. Metal catalysts can be incorporated into the compositions to produce shaped articles having oxygen-scavenging properties.

L~invention concerne un procédé de fabrication d~articles conformés comme, par exemple, des feuilles, des films, des tubes, des bouteilles, des préformes et des profils, de transparence élevée et de faible voile, comprenant des mélanges immiscibles d~un ou de plusieurs polymères thermoplastiques sélectionnés parmi les polyesters, les polycarbonates et les polyarylates, et un copolyamide ou bien un mélange homogène transamidé d~au moins deux polyamides. Les composants du mélange immiscible ont des indices de réfraction différant d~environ 0,006 à environ -0,0006. La faible différence au niveau des indices de réfraction permet d~incorporer une matière rebroyée dans la composition polymère pour produire des articles conformés transparents. Ces articles peuvent avoir une ou plusieurs couches et présenter des propriétés de protection excellentes et améliorées de même qu~une bonne capacité de traitement par fusion tout en conservant d~excellentes propriétés mécaniques. On peut incorporer des catalyseurs métalliques à une ou plusieurs couches pour conférer des propriétés de balayage d~oxygène.

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